Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Horns Diagnostic System Check? | -- | Go to Step 2 | |
2 | Verify that the horns are inoperative. Do the horns operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp light at both positions? | -- | Go to Step 4 | Go to Step 5 |
4 |
Does the test lamp light? | -- | Go to Step 6 | Go to Step 16 |
5 | Replace the underhood fuse block, Refer to Underhood Fuse Block Replacement in Engine Electrical. Is the repair complete? | -- | Go to Step 21 | -- |
6 | Using the J 35616 , connect a fused jumper between underhood fuse block terminal 3 and terminal 5 at the horn relay. Does the horn sound? | -- | Go to Step 7 | Go to Step 8 |
7 | Replace the horn relay. Refer to Horn Relay Replacement . Is the repair complete? | -- | Go to Step 21 | -- |
8 | Is the HORN fuse open? | -- | Go to Step 9 | |
9 |
Is battery voltage measured? | -- | Go to Step 10 | Go to Step 11 |
10 | Replace the horn. Refer to Horn Replacement - Left Side or Horn Replacement - Right Side . Is the repair complete? | -- | Go to Step 21 | -- |
11 | Do not remove the jumper leads from horn terminal A and terminal B. Using the fused jumper to B+, probe terminal B at the horn. Does the horn sound? | -- | Go to Step 12 | Go to Step 14 |
12 | Inspect for an open or high resistance in CKT 1329 between terminal B of the horn and underhood fuse block connector C4 terminal A6. Was an open or high resistance condition found? | -- | Go to Step 13 | Go to Step 5 |
13 | Repair the open or high resistance in CKT 1329. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 21 | -- |
14 | Inspect for opens or high resistance conditions in ground CKT 150 or CKT 250. Was an open or high resistance found? | -- | Go to Step 15 | Go to Step 16 |
15 | Repair the open or high resistance in CKT 150 or CKT 250. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 21 | -- |
16 |
Is DTC B2752 displayed as a current DTC? | -- | Go to DTC B2752 Horn Relay Coil Circuit Low in Body Control Systems | Go to Step 17 |
17 | Backprobe C211 terminal A11 using a fused jumper lead connected to ground. Does the horn sound? | -- | Go to Step 18 | Go to Step 19 |
18 | Repair the open or high resistance in CKT 28 from C211 terminal A11 through the horn switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 21 | -- |
19 | Inspect for an open or high resistance in CKT 28 from C211 terminal A11 to underhood fuse block connector C1 terminal B2. Is the circuit OK? | -- | Go to Step 5 | Go to Step 20 |
20 | Repair the open or high resistance in CKT 28 from C211 terminal A11 to underhood fuse block connector C1 terminal B2. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 21 | -- |
21 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
